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Departing Google product chief Jonathan Rosenberg will be writing a book with former CEO Eric Schmidt about the company's rules, values, and cultures.

Speaking to the San Jose Mercury News, Rosenberg also confirmed that he is leaving because he could not meet new CEO Larry Page's demand for a long-term commitment, as Business Insider's Nicholas Carlson reported earlier today.

Rosenberg had long planned to step down in 2013 when his youngest daughter begins college.

Rosenberg also told the Mercury that he had a rough first year at Google, as its engineering culture didn't take kindly to his top-down management style."I found the Google donor patient basically was rejecting the Jonathan donor tissue," he told the Mercury-News. "This was not a company that wanted a senior executive to come in and dictate to people the decisions that needed to be made to move the company forward."

In an emailed statement, Google CEO Larry Page said that the company "tried to hire Jonathan multiple times because he was the only person we could imagine doing the job. It's lucky we were so persistent." Schmidt, who stepped down from the CEO job to become the company's executive chairman, said Rosenberg was "crucial to our success over the last nine years."

Rosenberg was a big driver behind the company's public stance toward open platforms and standards -- in 2009, he published a manifesto about openness on Google's corporate blog.

Of course "open" is a relative term, as shown by Google's recent crackdown on the Android source code and partnership model, as well as its (totally understandable) refusal to release certain information about its search and ad algorithms.